Rotary cutting disk



Nov. 28, 1944. S P. ZIPPER 2,353,769

ROTARY CUTTING DISK Filed June 26, 1942 IN VENT OR.

BY C/zarZeaFZQaen Patented Nov. 28,1944

FFlCE ROTARY CUTTING DISK Charles F. Zipper, Des Plaines, 111., assignor to Albert G. Mather, Chicago, Ill.

' Application June 26, 1942, Serial No. 448,572 2. Claims. ('01. 29-78) The object of this invention is to provide an improved cutting device for use in reducing'various solid materials to a powder, flake or gran,- ular form.

Th improved device is a rotary disk-like member which has a circumferentially continuous cutting face of considerableradial extent produced by the toothed edge of a long thin metal saw band wound into a tight spiral coil.

I2 and preferably covers the greater part of the surface of the plate, extending radially from a especially advantageous in the reduction of such 7 materials as magnesium and aluminum because of the high speed with which it can accomplish the desired reduction and the great quantities of metal itcan reduce before evidencing any appreciable Wear.

The device can be used alone, or it can be in- A preferredembodiment of the invention and one modified form are presented herein for the purpose of exemplification, but it will of course be appreciated that the invention may be incorporated in various other structurally modified point near the center of the plate to the outer periphery of the latter. Theoutermost loop of the coil I I is preferably confined within a tightly fitting hoop M which, like the coil H, is welded to the plate. The plate 12 is adapted to be rigidly mounted upon a rotary driving member by any suitable fastening means, such as the screwthreaded attaching studs l5. welded to the plate l2 along radial lines by weld deposits I6 which are located in radial slots I1 formed in the plate. The hoop l4 reinforces theouter edge of the cutting face of the disk.

In addition, during the construction ofthe disk, the hoop may serve to hold the band. H1 in its by subsequently cut shavings, thus giving a selfv cleaning action. to the cutting face of the disk.

The band II] is preferably about wide by about .020" thick, but may of course be of any desired width and thickness. The coil H and plate l2 are shown as flat, but it is conceivable forms coming equally within the scope of the appended claims.

In the accompanying drawing:

Fig. 1 is a face view of the new device;

Fig. 2 is a rear view of the same;

Fig. 3 is 'a radial section, taken on the line 33 of Fig. 1; l i

Fig. 4 is an arcuate section, taken on the line 44 of Fig. 2;

Fig. 5 is a perspective view of a short length of the saw band used in making up the device;

and l The coil II is positioned flatly against the plate shown, it will of course be understood that other ways of welding those parts together could be employed and that welding could be, dispensed with and other means of connection resorted to.

In Fig. 6 of the drawing a modified disk structure is shown in which the teeth of adjoining loops of the saw band l8 are spaced apart in a direction radially of the disk through the employment of a plain spacing band IS. The plain band, I9 is of less height than the saw band 18, and the two bands are wound up together to form the coil with the toothed edge of the saw band projecting beyondthe corresponding edge of the plain band. i

I claim: y u

1. A device of the character described, charac terized by a long thin saw band which is provided with a toothed cutting edge and is wound into a tight spiral coil to present a circumferentially continuous cutting face of substantial ra-, dial extent, and a rotary backing plate to which the coil is attached, said plate being provided with openings, and said coil being welded to the plate through the openings.

2. A device of the character described, charac- The coil II is terized by a long thin saw band which is provided with a toothed cutting edge and is Wound into a tight spiral coil to present a circumferentially continuous cutting face of substantial radial extent, a hoop in which the coil is confined, and a rotary backing plate to which the coil is attached, said coil having its rear face positioned against and secured directly to the plate independently of the confining hoop.

3. A device of the character described, characterized by a long thin saw band which is provided with a toothed cutting edge and is wound into a tight spiral coil to present a circumferentially continuous cutting face of substantial radial extent, and a rotary backing plate to which the coil is welded through radial slots formed in the plate.

- CHARLES F. ZIPPER. 

